Rotary machine with blade centering rings



Jan. 26, 1965 F. SCOGNAMILLO ROTARY MACHINE WITH BLADE CENTERING RINGS Filed July 18, 1963 INVENTOR. FAA/l/f SCOG/VA MIA! 0 AUTO/FIVE) United States Patent 3,167,022 ROTARY MAQHINE WlTH BLADE (ENTERING RINGS Frank Scognamillo, 118 Walnut St, Ridgewood, NJ. Filed July 18, 1963, Ser. No. 296,019 1 Claim. (Cl. 103-136) The invention herein disclosed relates to machines of the rotary pump type having blades slidingly confined in slots in a rotor operating eccentrically in a cylindrical pump chamber.

Objects of this invention are to maintain the sliding blades in concentric relation with the cylindrical pump chamber and to accomplish this with light, free running parts which will not add to the bulk of the machine or increase the load thereon.

Other special objects of the invention are to accomplish this in a simple low cost construction.

These objects have been attained by a novel form of construction in which the blades are controlled as to both outward and inward radial movement by light rings of less diameter than the rotor engaged in notches in the ends of the blades and freely received in annular grooves in the ends of the rotor of sufficiently greater width than the notches to allow for the relative eccentricity of the rotor in the cylindrical pump chamber.

Other novel features and advantages of the invention are set forth and will appear in the course of the following specification.

The drawing accompanying and forming part of thespecification illustrates a present preferred embodiment of the invention but structure may be modified and changed as regards the immediate illustration, all within the true intent and scope of the invention as hereinafter defined and claimed.

FIG. 1 in the drawing is a front elevation of one of these new machines, with front cover removed to show the sliding blades and controlling ring at that end of the blades.

FIG. 2 is a central vertical sectional view on substantially the plane of line 22 of FIG. 1.

FIG. 3 is a plan view of one of the notched blades.

FIG. 4 is a sectional view of the rotor, on substantially the plane of line 44 of FIG. 1 showing the wider annular ring receiving grooves in the ends of the same.

The body and housing of the machine illustrated is shown as made up of an annular cylindrical wall 7 closed at opposite ends by end walls 8 and 9, one at least, in this case the wall 8, in the form of a cover, removable for access to internal parts.

The rotor 10 is cylindrical in form, carried by shaft 11 in the cylindrical chamber, tangent at one point with the surrounding cylindrical wall.

This circumferential wall is shown as having an inlet and an outlet 12, 13 at opposite sides of the line of tangency.

The rotor carries blades 14, sliding in radial slots 15 therein, these blades having ends flush with the ends of the rotor and in free operating relation with the end walls of the cylindrical chamber.

The blades are centered and held in free running relation with the cylindrical wall of the chamber by rings 16 located at the ends of the rotor and of greater diameter than the shaft but of less diameter than the rotor, these 3,167,022 Patented Jan. 26, 1965 ICE rings having free running engagement in notches 17 in the end edges of the blades.

' The centering rings 16 are seated in flush relation in the ends of the rotor in annular grooves 18 in the ends of the rotor, sufficiently wider than the notches to allow for the eccentricity of the rotor in the cylindrical chamber.

These grooves in the ends of the rotor being wider than the rings by the degree of eccentricity of the rotor in the circular chamber enables necessary free floating action of the rings to hold the blades accurately centered and in proper running relation with the cylindrical wall in all angular positions of the rotor.

The relation of the centering rings to the blades may be such as to keep the blades actually in contact or with a certain amount of clearance with respect to the surrounding cylindrical wall, depending on conditions under which the machine is to operate.

The rings are free to rotate independently of the blades and rotor and by their connection with all the blades forces generated at one side may be balanced and eliminated by forces existing at the opposite side of the rotor.

The rings may be of substantially square cross section so as to seat flush in the ends of the rotor and in engagement with the blades, avoiding open space which may be of no utility in the operation of the machine.

The machine is of particularly simple and inexpensive construction. The end walls of the housing may be finished smooth and flat and similarly the ends of the rotor are correspondingly smooth and flat except for the ring receiving grooves therein.

Blades are of simple rectangular form with notches to receive the cross section of the rings cut in the end edges of the same.

The rings by their engagement in these notches control both inward and outward movement of the blades in their slots, assuring smooth, quiet running relation of the parts.

What is claimed is:

A rotary machine having radially sliding blades confined in both outward and inward movement by freely rotatable centering rings, comprising a casing having a cylindrical peripheral wall and flat, single plane spaced parallel end walls cooperatively forming 'a cylindrical chamber,

a shaft journalled eccentri-cally in said cylindrical chamber,

a cylindrical rotor on said shaft in tangential relation with the surrounding cylindrical wall of the chamber and having flat, single plane, parallel end walls in running engagement with said end walls of the cylindrical chamber,

said peripheral wall having inlet and outlet passages located at opposite sides of the point of tangency of the rotor,

said end walls of the rotor each having an annular substantially U-shaped cross section groove therein closed by the opposing end wall of the chamber,

said rotor having radial slots therein extending from the periphery of the rotor inwardly past the inner edges of the annular grooves in the ends of the rotor,

blades slidingly confined in said slots with their ends flush with the ends of the rotor and in running engagement with the end walls of the chamber,

said blades having substantially U-shaped notches in the end edges of the same in register with said annular grooves in the ends of the rotor,

blade centering rings substantially conforming in cross section to the notches'in the ends of the blades,

Said rings having free running engagement in said 5 notches in the blades and in said grooves in the ends of the rotor, and

said annular grooves in the rotor having a depth equal to the depth of the rings and a width equal to the 7 Width of the rings plus the extent of eccentricity of 10 the rotor in the cylindrical chamber and said grooves having spaced outer and inner circular confining walls limiting the outward and inward radial travel of the rings in respect to the rotor and thereby limitand holding the blades in centered running relation in the chamber.

References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS 1917 Great Britain, 4/22 Switzerland.

ing radial movement of the blades in both directions 15 JOSEPH H, BRANSON, 1a., Primary Examiner. 

